TY  - RPRT
TI  - Conclusions and perspectives for the future
AU  - T. J. O'Shea
AU  - G.D. Bossart
AU  - M. Fournier
AU  - J.G. Vos
PY  - 2003
UR  - https://pubs.usgs.gov/publication/70006601
ID  - 70006601
ER  -